Also, be aware that the 2/5 mile ranges they advertise are under ideal conditions. You could probably get those ranges on a cool night at a dry lake bed. But when used inside a vehicle, or outdoors through trees and over mountains, not very far. Get the most range you can afford and just hope for the best.
Motorola has some decent units that come in a pair with rechargeable batteries and a charging station for under $100. Plus, regular batteries can be used in place of the rechargeables for extended outings when recharging is not an option.
Don't expect much out of the VOX feature. You generally have to speak fairly loud in order for it to trigger the VOX. Once the VOX triggers you have to repeat the first second or so of what you said as that part wasn't transmitted. Think of the VOX being best used as a long range baby monitor. While the radio will transmit a whisper ok, and the recipient can hear it ok, it isn't enough to get the VOX to key up.